Patent GB-190814207-A (GB)
Title: Improvements in Bevel & Mitre Gear Cutting Machines.
Inventor: MATTERSON WILLIAM COLLEY MONKT
Filed: 1908-07-04
Granted: 1909-07-05
Abstract: 14,207. Matterson, W. C. M. July 4. [Cognate Application No. 28,384, A.D. 1908, dated Dec. 30.] Shaping; dividing-apparatus.-Bevel-gears with involute teeth are shaped in generating-machines in which the reciprocating tools slowly oscillate about the point coincident with the apex of the pitch cone and in a direction parallel to a plane tangential to the cone. The tools have the shape of, but are thinner than, a crown-wheel tooth, and two are used cutting on alternate strokes. The tool slide 19, Fig. 3, is adjustably connected to a slotted bar which engages a spherical-ended connecting-rod coupled to an adjustable-throw crank, to enable the position and length of stroke to be varied and to permit the tools to reciprocate in a plane inclined to that of the crank, so that the machine may be set to generate continuously about the pitch angle while the tools are cutting at the root angle. The tool-slide guide 18, Figs. 1 and 4, has a cylindrical seating at 22 and a segmental slot adjustment at 64 in the tool-head 31, and is set at an angle to the head equal to the angle between the root of the teeth and the pitch cone. The head 31 is mounted in circular guides 14, which have a base angularly adjustable on an oscillating circular slide 76. The pivot 23 of the head 31 contains a hollow shaft 45, which carries the driving-crank and is driven from a shaft 17 bevel-geared to a cone-pulley shaft through the shaft 43. The blank to be cut is mounted on an arbor in the mandrel 48, and the part 14 is adjusted on the base 76 according to the angle of the pitch cone A pulley 69, Fig. 4, bevel-geared to a shaft 70, Fig. 7, drives a shaft 63 through gearing 32, or change-gearing 88, and worm-gearing 33, the gear 32 or 33 driving according to the position of a clutch 86 and providing a quick-return motion. The shaft 63 is geared at 7<a> to the shaft 7 either directly or through back-gearing, and thence through a clutch 66 and gearing 46, loose on the shaft 43, and a worm to oscillate the head 31, Fig. 1, for the generating-motion. A corresponding rotation of the wheel blank is obtained through change-gearing to a shaft 67, Fig. 7, change-gearing 1, Fig. 5, and shafts 68, 73, driving the arm of differential gearing 3. The bevel-wheel on one side of the arm is connected to the indexing- mechanism through change-gearing 2 and shaft 61, and the bevel-wheel on the other side drives the shaft 6 geared to the mandrel 48 as shown in Fig. 3. The shaft 7 is also geared to a screw traversing a slide 82, which trips the indexing- mechanism through a stop 90 and linkage 84 ; this withdraws a plunger from a notched disk on the shaft 61, allowing the latter to make one revolution while driven by a friction clutch 60 geared through a sleeve to the shaft 67. The slide 82 also operates linkage 85 through dogs 91 to throw over the clutch 86. Drive is also taken from the ,shaft 7 through a shaft 77a, Fig. 4, friction clutch ,78, Fig. 3, geariug 79, and a worm 80 to oscillate the base 76 to move the tools into and out of operative relation with the wheel-blank. Stops adjustable in an annular groove in one of the wheels 79 engage with a fixed projection 81, Fig. 4, to limit its motion. To finish the other sides of the teeth the tools are reversed, and the graduated spacing-head 92, Fig. 7, on slacking-back the nut 93 permis setting to the required amount by a handle on the squared end of the shaft 67. When gasbing-out from the solid, the clutch 66 is disengaged, the head 31 is clamped, the changegearing 1 is removed, the arm of the differential gearing is locked, and the wheel 7<a> is clutched to the shaft 7 through the back-gearing to cause the worm 80 to be driven at a reduced speed.